hazardousH₂SCAS 7783-06-4
Valves for Hydrogen Sulphide (H₂S - Sour Gas) Service
Hydrogen sulphide (H₂S) is a highly toxic, flammable gas encountered in crude oil and natural gas production ('sour service'), refinery amine treating, geothermal wells, biogas/landfill gas, and Claus sulphur recovery units. H₂S is immediately life-threatening at >100 ppm (IDLH); lethal at >500 ppm. Beyond toxicity, dissolved H₂S causes sulphide stress cracking (SSC) and hydrogen-induced cracking (HIC) of carbon and low-alloy steels at even very low partial pressures. NACE MR0175/ISO 15156 compliance is mandatory for all metallic valve components in sour service.
Pressure Range
1–700 barg (wellhead to processing)
Temperature
Ambient to +300°C (Claus SRU)
Industries
Upstream oil & gas (sour wellheads), Refinery sour crude service, Gas sweetening (amine treating)
What valves are used for Hydrogen Sulphide (H₂S - Sour Gas) service?
Ball Valve (NACE MR0175, WCB body, Inconel trim) are recommended for Hydrogen Sulphide (H₂S - Sour Gas) service: Standard isolation for sour gas, crude oil, and multiphase hydrocarbon pipelines.
Key Properties - Hydrogen Sulphide (H₂S - Sour Gas)
- IDLH: 100 ppm; lethal above 500 ppm - immediately dangerous to life and health
- SSC risk: H₂S partial pressure >0.0003 MPa (0.05 psia) triggers NACE MR0175 sour service
- HIC: hydrogen absorbed at surface causes sub-surface blister cracking in plate/pipe steels
- SOHIC (stress-oriented HIC): combined effect of hydrogen + welding residual stress
- Flammable: 4–44% in air - ATEX Zone 1 in production areas
Vajra Industrial Solutions manufactures and supplies valves for Hydrogen Sulphide (H₂S - Sour Gas) service — including ball valve (nace mr0175, wcb body, inconel trim) — in corrosion-appropriate materials selected for the operating conditions described here, with full material and test documentation.
Need valves for Hydrogen Sulphide (H₂S - Sour Gas) service?
Send your fluid conditions — we'll recommend the right valve, material and standard, with a 24-hour quote.
Material Compatibility - Hydrogen Sulphide (H₂S - Sour Gas)
Ratings are indicative. Actual compatibility depends on concentration, temperature, velocity, and presence of contaminants. Always consult corrosion tables or a materials engineer.
| Material | Rating | Notes |
|---|---|---|
| NACE MR0175 qualified WCB (hardness controlled) | Excellent | Mandatory - Brinell hardness ≤200 HBW, Rockwell C ≤22 HRC, CE ≤0.43 per NACE MR0175. |
| SS 316L (NACE qualified) | Good | Acceptable for most H₂S service; use low-carbon grades, verify with NACE MR0175 SSC zone. |
| Duplex 2205 (NACE qualified) | Good | Restricted to solution-annealed condition, max hardness per NACE MR0175 Table D.1. |
| Inconel 625 (UNS N06625) | Excellent | Excellent SSC resistance; used for valve trim and high-alloy applications. |
| Standard carbon steel (uncontrolled hardness) | Not Recommended | SSC failure risk - mandatory to verify NACE compliance. |
Recommended Valves
Ball Valve (NACE MR0175, WCB body, Inconel trim)
Standard isolation for sour gas, crude oil, and multiphase hydrocarbon pipelines
Full selection guideGate Valve (NACE, API 600)
Full-bore sour gas line isolation; through-conduit slab gate for pipeline service
Full selection guideGlobe Valve (NACE, Stellite trim)
Control service in sour service amine treating and gas sweetening plants
Full selection guideCheck Valve (dual plate, NACE MR0175)
Compressor and pump protection in sour service
Full selection guideESD Ball Valve (NACE, fire-safe, SIL rated)
Emergency shutdown for wellheads and sour gas processing
Full selection guideValves to Avoid
Any valve with hardness >200 HBW body or >22 HRC trim without NACE MR0175 qualification
Chrome-plated stems in H₂S service - plating creates galvanic cell
Special Considerations
Applicable Standards
Shop Valves for Hydrogen Sulphide (H₂S - Sour Gas) Service
Other Fluid Services
Hydrogen Sulphide (H₂S - Sour Gas) Service — Procurement & Specification
Typical Applications
Available Standards
Material Options
Documentation Available
- -EN 10204 3.1 Material Test Certificates (heat traceable)
- -API 598 hydrostatic shell & seat test reports
- -Dimensional inspection reports
- -Full Manufacturing Data Record (MDR) / data book on request
Inspection Options
- -In-house QC inspection on every order
- -Third-party inspection (SGS / Bureau Veritas / TÜV / DNV) coordination
- -Witness and hold points accommodated on request
Order Quantities
Flexible — from single critical-spare valves to full project lots.
Export
Worldwide export with complete documentation (COO, EUR.1, packing lists) to 20+ countries.
Custom Engineering
Built to your specification — materials, trim, pressure class and special service (NACE, fire-safe, IBR, cryogenic).
Delivery Support
Dispatch from Vadodara, Gujarat with documented lead times and priority handling for urgent requirements.
Engineering references
Connected Engineering
Need Valves for Hydrogen Sulphide (H₂S - Sour Gas) Service?
Tell us your fluid, pressure, and temperature — we'll recommend the right valve, material, and standard, with a 24-hour quote.